For someone (agent muɴ- & theme i-) to lie face down in a fetal position, typically on one's face, with the legs drawn up.
Nan ung'ungungnga ya unda munyakamma an molo' hinan umu'uddum.
As for children, they lie face down in a fetal position when sleeping sometimes.
Theme, unexpressed, is reflexively on oneself or on the feet.